Martin owns a food truck that for the past five years has frequented local festivals selling fried cheese curds. He has experienced a variation in sales for no known reason and wants to develop a forecast using the exponential smoothing method. After loading data from the previous $20$ days, the following summary table was calculated. What is the MSE?

Day Curds At y$$t et $=$ yt $$ y$$t e$2|$e$|$

$170$

$26969\mathrm{.}770111$

$36768\mathrm{.}8969\mathrm{.}72\mathrm{.}77\mathrm{.}292\mathrm{.}7$

$.....................$

$206163\mathrm{.}0363\mathrm{.}92\mathrm{.}8988\mathrm{.}396822\mathrm{.}8977$

Total $213\mathrm{.}19951\mathrm{.}421$

Multiple Choice

$11\mathrm{.}22$

$2\mathrm{.}710$

$4\mathrm{.}15$

$10\mathrm{.}66$